Why does an indicator change from its acid color to its base color over a range of pH values? In general, when do color changes start to occur for indicators? Can the indicator thymol blue contain only a single OCO2H group and no other acidic or basic functional group? Explain.

Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
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Chapter14: Acid- Base Equilibria
Section: Chapter Questions
Problem 79E
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Why does an indicator change from its acid color to its
base color over a range of pH values? In general, when
do color changes start to occur for indicators? Can the
indicator thymol blue contain only a single OCO2H
group and no other acidic or basic functional group?
Explain.

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